Metallic rod-packing



(Hmmm s. P. LONG.

METALLIC ROD PACKING.

No. 494,818. Patented Apr. 4, i893;

UNITED STATES PATENT OFFICE.

SAMUEL F. LONG, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE UNITED STATES METALLIC PACKING COMPANY, OF PENNSYLVANIA.

METALLIC ROD-PACKING.

SPECIFICATION forming part of Letters Patent No. 494,818, dated .April 4, 1893.

Application iled November 4, 1892. Serial Na 450,980. (No model.)

To a/ZZ whom t may concern,.-

Be it known that I, SAMUEL F. LONG, a citi- -zen of the United States, residing at the city issued Letters Patent No. 9,365, dated August 31,1880, and granted. to Martin Schneble,that

is, so far as the packing itself is concerned.1

In Figure 2 of the aforesaid patent, there is shown a packing box, the inner face of the cover of which has a concave surface. against this shoulder is a ring with a convex outer and a4 plain inner surface. Bearing upon this inner surface is a packing receptacle,havinga plain front face and tapering recess in which are placed packing rings. In Fig. l of the patent, there is shown a follower which bears upon the packing rings, being constantly pressed forward by aspring.

In a companion application of mine, filed, Novemhere, i892, Serial No. 450,979 I have similarly referred to the construction disclosed in said re-issned patent, and have pointed out more at length certain objections incident to said patented arrangement. It will be snfticient for present vpurposes to direct attentionto the fact that in said patent, the follower is shown of such coniguration and disposition that it is liable to work beneath the end edge of the receptacle and thus become inoperative for its primary purpose to wit, forwardly pressing the packing rings. The liability referred to is increased by the fact that the follower has considerable transverse play on the rod, and can be canted or tilted to engage one side of the receptacle.

To avoid the objections referred to in the foregoing, I have devised certain improvements, the subject matter of the present case showing the same adapted for use in connection with metallic packing for valve stems.

In the accompanying drawings forming part of this specification, Fig. l, is a longitudinal sectional view of a construction embodying my improvements, and Fig. 2, is an end view of the same.

The end wall A, of the valve chest has an Seated y opening, through which the stem l5, plays, a gland a, being seated in said opening. A tapering coiled spring b, bears at its rear against said gland.

The packing box cover C, is suitably bolted on the end wall A, a wire gasket e, seated in a recess in the rear of cover insuringa steam tight bearing for the latter. Vivithin the cover,

adjacent to the front opening thereof, is a con-V cave shoulder, receiving the bearing ring D, con vexed on its front side, and having a plane surface at its rear. i

Nithin the cover chamberjiis the packing ring receptacle E, having a hat ,front face bearing against the ring D, and provided with a tapering recess in which the packing rings g, h, i, of corresponding shape are located. A follower F, extends for a short distance within the receptacle E. This said follower is normally forwardly pressed by a cup sleeve I, the head .s of which bears against the follower. The said sleeve I, contains that portion of the tapering sprin g b, which extends into the cover chamber; the forward coil of said spring being seated against the inner side of head s, of the sleeve.

By reference to Fig. l it will be noted that the transversediameter of the cover chamber' is greater thanthat of the opening in the wall of the valve chest, so that a portion of said wall projects to present a shoulder' 7.9. The spring pressed cup sleeve I, normally causes the followerto hold the packing rings snugly with in the receptacle, and thus secures a steam tight packing for the rod. This receptacle E, is freely movable in all directions within the cover chamber, and this capabilityin connection with the ball bearing adorded by the ring D against which it bears, enables it to automatically accommodate itself to variations in the stroke alignment of the stein, due to wear or otherwise.

In my said companion application, I have shown and described a follower extending into the receptacle and pressing on the packing rings, said follower being provided with a lat- 

